Adventure Sync (Japanese: いつでも冒険モードAnytime Adventure Mode) is a feature in Pokémon GO that allows players to track walking distances when the game is completely turned off. This is done via the API of Apple's Health app for iOS and Google Fit for Android. The feature was introduced on November 1, 2018.
Every Monday, at 9:00 AM local time, players can redeem weekly rewards based on the total distance they walked in the past seven days. Rewards are given for hitting total weekly distance of 5 km, 25 km and 50 km. Rewards for longer distances include the rewards earned at shorter distances. At each benchmark, players will receive all guaranteed reward bundles plus one of the random reward bundles.